Fire arch



Aug. 16, 1927.

o. A. TOFFTEEN FIRE ARCH 2 Sheets-Sheet l I Filed Sept. 30, 1925 o oo 03 9 a 0 3 aa 0.0 of

d0 00 90v z v V 1,639,117 0. A. TOFFTEEN FIRE ARCH Aug. 16, 1927.

Filed Sept. 50, 1925 2 SheetsSheet 2 1 Fatentecl Aug. 16, 1927.

UNITED STATES OLOF A. TOFF'IEEN, OF CHICAGO, ILLINOIS. 7

FIRE ARCH.

Application filed September 30, 1925. Serial No. 59,552.

:1? This invention relates to improved fire arch constructions adapted to be designed for use in any desired type of boiler, the fire boxes of which are adapted to be readily equipped with the improved arch and battle means which are preferably constructed of a carborundum product to withstand the great heat to which the arches and bafiles are adapted to be subjected.

It is an ob'ect of this invent-ion 'to provide a boiler fire box with an improved apertured fire arch having smoke and flame outlet sleeves mounted therein.

It is also an object of this invent-ion to provide a boiler fire box with an improved fire arch and battle mechanism, said fire arch and battle mechanism being constructed of a refractory material and having suitable air feed perforations therein, as well as escape 2O pipes or flues, permittingsmoke and the flames of combustion to pass through the fire arch and through the baffle mechanisms.

It is a further object of this invention to provide a boiler fire arch constructed of 2 bricks or tiles of hollow perforated construction having perforated smoke and flame escape sleeves therein.

It is furthermore an object of this invention to provide a fire arch constructed of perforated hollow tiles made of a refractory material, said tiles having flame passageways therein which alsocommunicate with the interior of the tiles.

Another object of the invention is to provide a boiler fire box .fire arch constructed of a carborundum product andhaving air sup-, ply apertures and flame escape p assagewaystherein to materially assist in a complete combustion of the fuel onthe grate of the firebox.

Still another object of the invention isto provide a boiler fire arch constructed of a plurality of bricks or tiles so formed that when the same are assembled in the form of a fire arch or baffle wall, the supply of air may be augmented through suitable air supply apertures and the escape of the flames and smoke is facilitated by the provision of suitable passageways or lines for the purpose. M

It is an important object of this invention to provide a boiler fire arch constructed of hollow perforated carborundum material, such as fused silicon carbide, so that the fire arch will not only increase the efliciency of the fuel consumption, but will also withclosures in the specification and the accQmpanying drawings. This invention, (in apreferred" form) is illustrated in the drawings and hereinafter more fully described.

Onthe drawings:

Figure 1 is a fragmentary longitudinal sectionthrough a horizontal boiler fire box equipped with an improved fire arch and bafiie wall embodyingthe principles of this invent on. Figure 2 is a transverse section of the boiler fire box taken on line II- II of F igure 1. i

Figure 3 is an enlarged detail section taken online III'III of Figure 1.

Figure l-"is "a fragmentary longitudinal section through another type of horizontal boiler, which is equipped with a modified form of fire arch. I v I it F1gure 5 is a sectional view taken on line V V of Figure l. V l 7 Figure 6 is a plan view of a plurality of improved fire bricks or tiles of a modified form, adapted to be assembled to form a fire arch orbafiie wall. i Figure 7 is a plain View of a pluralityof associated fire bricks or tiles. of still another modified form; I

As shown fon the drawings:

The reference numeral 1 indicates a fragmentary portion, of a horizontal boiler having' a pluralityof tubes'Q which communicate with a fire box 3. Mounted in the fire box is a fire grate 4 upon which the improved fire arch of this-invention is adapted to be mounted or built.

v The improved fire arch comprises a hollow rear wall constructed of a plurality of as sembled hollow fire bricks :or tiles 5, the lower ends of which rest on the grate and are open to permit air to pass upwardly through the grate and through said rear wall tiles. Connected with the upper ends of ,the rear wall tiles 5 are a plurality of arch wall tiles 6 which are built up to form an arched wall which projects forwardlyfrom the rear wall toward the front walllof thefire box. The ends of the arched portion justdescribed are supported by means of a. plurality of hollow fire bricks v.Or rues 7, the lower -.p ortions of which. have large openings 8 formedftherein to afford a means whereby the heat from the .fire bed may come into direct contact w1th the inner face of the side walls of the fire box 3. The fire bricks or tiles 7 are of a hollow construction to permit air passing upwardly through the grate to pass upwardly through said fire bricks or tiles and be discharged through a plurality of air feed perforations or apertures 9. The fire bricks or tiles 6 are also of a hollow construction and are provided with end apertures 10, upper apertures 11, bottom apertures 12 and side apertures 13. All the apertures in the fire bricks or tiles forming the upper arched wall are arranged near the upper end of the arch as clearly illustrated in Figure 1. The completed fire arch formed by means of the hollow rear wall tiles 5, the hollow upper arched wall tiles 6 and the hollow side wall tiles 7 is adapted to be mounted on the fire grate so charged into the fire box above the bed of fuel to assist in the complete combustion of thefuel. The various tiles used in the construction of the fire arch are all made of a refractory material, such as a carborundum product or of a mechanically, chemically or electrochemically fused silicon carbide. As clearly shown in Figures 1 and 2, the upper wall fire bricks or tiles 6 are provided with large openings which extend transversely through the tiles and have securely engaged therein smoke and flame out-let sleeves, pipes or flues 14 open at both ends and provided with a plurality of air outlet passages 15in the side walls thereof. It will thus be seen that the upper arched wall of the fire arch is of a hollow perforated construction having suitable air supply apertures therein, as well as apertured flame and smoke discharge flues or sleeves 14.

Suspended from the top wall of the fire box 3 by means of suitable supports 16 is an improved baffle fire wall constructed of fire bricks or tiles 17 made of a carborundum product or of a fused silicon carbide. Each of the tiles is provided with air supply apertures 18 in the top, bottom, side and end walls. Each of the bafiie fire bricks or tiles is also provided with a plurality of flame and smoke escape sleeves or flues 19 open at both ends and provided with a plurality of air apertures 20 in the side walls thereof. The battle tiles 17 are arranged, as shown in Figures 1 and 2, across the upper portion of the fire box to form a complete bafile wall. the front end of which is formed to afford an air supply channel 21, the end of which opens-through the front of the fire box and is controlled by means of a damper or shutter 22. The battle wall is also positioned above the improved fire arch to coact therewith in securing a complete combustion of the fuel on the fire grate 4.

The apertured tiles and the sleeves thereof forming the completed fire arch and the baflle wall are constructed of fused silicon carbide or are made of a carborundum product commercially known as Carbofrax, to afford a fire arch and baffle wall construction which will stand up under the severe heat to which they are subjected. lVith a bed of fuel on the fire grate 4, air is admitted from the ash pit upwardly through the grate through the hollow rear tiles 5 of the fire arch and through the hollow legs or columns of the side wall tiles 7 and then circulates upwardly through the top wall tilesv 6 with the air escaping through the various air outlet apertures 9, 10, 11, 12 and 13. It will thus be seen that the fire within the fire box is supplied with an additional supply of air above the fuel bed, thereby augmenting the supply of oxygen to the flames to cause a substantially complete combustion of the fuel to permit the flames and smoke to pass through the top wall of the fire arch, as well as around through the front of the fire arch. The apertured sleeves or flues 14 are provided in the tiles 6 so that a portion of the flames and smoke may pass through the top Wall of the fire arch. When the shutter 22 is open, air is admitted into the front end of the loafiie wall positioned across the top'of the fire box above the fire arch. The air ad mitted into the bafile wall is permitted to escape through the various openings or aper- In tures 18 to still further augment the supply of oxygen to the upwardly flying flames. The battle wall is also equipped with flame and smoke sleeves or flues 19 to permit the flames and smoke to pass upwardly through the bafiie wall against the top wall of the fire box which serves to direct the same out between the boiler tubes 2. The provision of the flame escape sleeves or flues in the fire bricks of the fire arch and baflle wall also permits the flames when passing through said sleeves to be augmented or supplied with additional oxygen through the apertures in said sleeves which communicate with the interior of the hollow fire bricks or tiles.

Figures 4 and 5 illustrate a modified form of fire arch adapted for use in the fire box of a different type of horizontal boiler 28. In this case the fire box 24 is equipped with a fire grate 25. Mounted upon the fire grate 25 is an improved fire arch consisting of a hollow rear wall made up of a plurality of hollow fire bricks or tiles 26 which are positioned to interfit with one another across the low-er portion of the rear wall of the fire box. Built into the upper ends of the rear wall fire bricks 26 are a plurality of top wall fire bricks 27 which are also of a hollow construction and have air supply apertures 28 in the top, bottom, end and 35 are the equivalent of the flame escape" side walls thereof. The top fire bricks 27 are fitted together and completely cross the fire box in an inclined plane extending upwardly toward the front end of the fire box. The top wall of the fire arch is supported in position within the fire box by means of suitable piping 29 connected with the water supply system so that water may be continually circulated through the pip-es of the supporting frame to prevent burning up of the same. Each of the top wall fire bricks or tiles 27 is provided with flame escape sleeves or flues 30 each having a plurality of air supply apertures 31 in the side walls thereof. The flames from the bed of fuel on the grate are thus permitted to pass upwardly not only around the upper front end of the fire arch but are also permitted to pass through the flame escape sleeves or flues provided in the fire bricks 27. The flames are supplied with an additional supply of oxygen carried by the air escaping from the apertures 28 of the top wall of the fire arch. Air is also suppliedthrough the apertures 31 of the sleeves 30 to portions of the flames passing upwardly through the fire arch. It will thus be seen that the flames in the fire box are adapted to be "supplied with additional oxygen to cause a substantially complete combustion ofthe fuel and affording a: particularly high temperature for the purpose of heating-the boiler tubes. j

Figure 6 illustrates a fragmentary :por-

tion of a fire arch wall constructed of a.

modified formof fire brick or tile 32 of a substantia y I construction having side recesses 33 and a plurality of-air escaping apertures 34 in all of the walls thereof. 'The fire bricks 32 are adapted to be positioned adiacent one another as illustrated in Figure 6 so that when in abutting relation, flame escape channels or passages 35 are afford-ed by the registering recesses 33 of adjacent fire bricks. The flame escape passageways passages afforded byth-e sleeves .14 and 19 illustrated in Figure 1. Figure 7 illustrates a plurality of modified tile bricks 36 of oc-,

tagonal shape, the top and bottom walls and side walls of which are provided with air supply apertures '37. Vhen four of the fire bricks 36 are associated, as illustrated in Figure .7, flame escape passageways 38 are afforded between the respective fire bricks. It will of course be understood that the fire bricks used in the construction of the fire arches describedmay be of any de-' sired design to meet requirements and furthermore may be assembled to produce an arch of proper design to fit. substantially any type of boiler. The fire bricks or tiles are all made of a refractory material, Such as a carborundum product or fused silicon carbide, so that the bricks or tiles will withtypes of boiler proved fire arches and 'bafiie walls of this While two different types of horizontal boilers are illustrated in the drawings and are equipped with improved firearches and a bafile wall, it is to be understood that fire arches and battle walls constructed similar to those illustrated and described; may be designed to meet the requirements of all constructions. The 1111-- invention are constructed of the improved material referred to and are of hollow construction having the required number. of air supply apertures properly located therein, in addition to being equipped with the apertured flame escape sleeves except in such cases where the fire bricks are shapedtoafford flame escape passageways when said fire bricks are assembled as illustrated "in Figures 6 and of the drawings.

I am aware that many changes .may be made, and numerous details of construction maybevaried through a wide range without departing fromthe principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior' art.

I claim as my invention: 1. The combination with a boiler fire box, of a hollow fire arch mounted therein having air supply apertures and flame escape passageways therein, a fire bafl'le wall mounted in said fire box above the fire arch, with said baffle wall having air supply apertures and flame escape passageways therein, and means at one end of said fire baffle wall for controlling the passage of air therein.

ill)

'2. The combination with a boiler fire box,

of a hollow apertured fire arch mounted therein with the open end of said fire arch directed forwardly, aperturedsleeves .mounted in said fire arch, a hollow apertured baflie wallmounted in said fire box above the fire arch and projecting rear-T. wardly from the front wall of the fire box over the fire, arch, adjustabley means on the front of the fire box for controlling the'pasfire arch, a hollow apertured baffle wall mounted in the fire box and directed rear- Wardly above the fire arch, and aperturedsleeves mounted in said baffle wall;

4. The combination with a boiler fire box, of a plurality of hollow apertured walls mounted therein and directed in opposite.

directions, one above the other, and apertured sleeves mounted in said walls.

' In testimony whereof I have hereunto subscribed my name.

' QLOF A, TOFFTEEN. 

